Here’s the size chart for choosing the Seac UV-shirt for kids (unisex model). The measurements are given as full circumferences, making it easy to compare them directly with your child’s measurements.
This UV-shirt is designed for sun protection and should fit close to the body to work best in the water. The fabric is stretchy, but since kids grow fast, we recommend paying special attention to chest and waist size. The sizes (3#, 5#, etc.) generally indicate age, but for the best fit, always measure first.